Calvin DeWitt is an environmental scientist and a professor of environmental studies at the University of Wisconsin in Madison. He is also a practicing Christian. From 1979-2005, DeWitt served as president and director of the Au Sable Institute for Environmental Studies, an organization that enables college-level students to study ecology and the environmental sciences through a theological lens of caring for the "Creation." Through his writing and traveling across the world to speak on Creation Care, DeWitt plays a critical role in furthering the dialogue between scientists and the religious community to engage evangelicals in environmental stewardship. In 2000, DeWitt worked alongside some 50 other evangelical scientists to build a bridge to the religious community in order to mobilize action on climate change policy. This resulted in the Evangelical Climate Initiative, signed in February 2006 by close to 100 prominent evangelicals, including Rick Warren, author of The Purpose Driven Life.